As a means of recording the passage of time, the 4th century (per the Julian/Gregorian calendar and anno Domini era) was that century which lasted from 301 to 400.

Overview

Events

• 301: Armenia first to adopt Christianity as state religion
• 306–337: Constantine I, ends persecution of Christians in the Roman Empire, calls First Council of Nicaea, see also Constantinian shift, Constantinople becomes new seat of government (New Rome)
• 378: Battle of Adrianople
• 378–395: Theodosius I, Roman emperor, bans pagan worship, Christianity is made the official religion of the Empire.
• 383: Battle of Fei River in China

Significant People

• Arius, founder of Arianism
• Athanasius, opponent of Arius
• Saint Augustine of Hippo, theologian
• Saint Ambrose, bishop of Milan
• Basil of Caesarea, reformer of Christian monasticism
• Eusebius, famous Christian Church historian
• Frumentius, Apostle of Ethiopia
• Ge Hong, Chinese alchemist
• Ammianus Marcellinus, Roman Historian
• Saint Martin of Tours
• Pachomius, founder of Christian monasticism
• Ulfilas, apostle of the Goths
• Gwanggaeto the Great of Goguryeo, King of ancient Korean state Goguryeo who greatly expanded its territory

Inventions, discoveries, introductions

• Kama Sutra
• Codex Sinaiticus, Codex Vaticanus, earliest Christian bibles

Decades and years

4th century | Centuries

4de eeu | 4. Jahrhundert | Sieglo IV | 4. vijek | IVe kantved | 4 век | Segle IV | 4. století | 4. århundrede | 4. Jahrhundert | 4. sajand | 4ος αιώνας | Siglo IV | 4-a jarcento | IV. mendea | IVe siècle | 4e ieu | 4세기 | 4. stoljeće | 4ma yar-cento | Abad ke-4 | 4. öldin | IV secolo | המאה ה-4 | Abad kaping 4 | 4a kansblydhen | Saeculum 4 | 4. Joerhonnert | IV amžius | Veerde iew | 4. század | 4 век | 4e eeuw | 4世紀 | 4. århundre | 300-talet | IV wiek | Século IV | Secolul IV | IV век | Shekulli IV | Sèculu IV | 4th century | 4. stoletje | 4. век | 300-luku | 300-talet | 4. yöz | คริสต์ศตวรรษที่ 4 | 4. yüzyıl | 4 століття | 4世纪